US3816753A
Expired / Lapsed
US
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Parametric acoustic surface wave apparatus
Assignee: Leland Stanford Junior University
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Filing: 1971-10-18
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Granted: 1974-06-11
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Expires: 1991-10-18
Abstract
Abstract Parametric surface acoustic wave apparatus including means for establishing two acoustic surface waves in a piezoelectric medium in a fashion to establish the conditions for parametric interaction so that various functions of signal processing can be carried out including, for example, signal convolution and correlation, time delay and time inversion, amplification, and oscillation.
Inventors
- 👤 G Kino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:55
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/19; G06G7/195; G10; G10K; G10K11/00; G10K11/36; H; H03; H03B; H03B19/00; H03H; H03H9/00; H03H9/30; H03H9/42; H03H9/423
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
151 words
Parametric acoustic surface wave apparatus which comprises, a piezoelectric medium, means for establishing at least two acoustic surface waves in said piezoelectric medium which meet the conditions for nonlinear parametric interaction, phase matching and frequency conservation, an output surface wave transducer adjacent said medium for effecting an acoustic-electric energy interchange whereby electrical energy resultant from the electric polarization in said medium can be coupled therefrom, said acoustic surface wave establishing means including a pair of input surface wave transducers adjacent said piezoelectric medium, said input transducers being arranged to generate two acoustic surface waves which propagate in opposite directions in said piezoelectric medium, said acoustic surface wave establishing means including means for applying first and second electromagnetic signals to said input transducers respectively, the first of said electromagnetic signals having the form of a delta function modulation pulse so as to interact with said second electromagnetic signal to time-invert the same.
Claim 2
Dependent Claim
151 words
Parametric acoustic surface wave apparatus which comprises, a piezoelectric medium, means for establishing at least two acoustic surface waves in said piezoelectric medium which meet the conditions for nonlinear parametric interaction, phase matching and frequency conservation, an output surface wave transducer adjacent said medium for effecting an acoustic-electric energy interchange whereby electrical energy resultant from the electric polarization in said medium can be coupled therefrom, said acoustic surface wave establishing means including a pair of input surface wave transducers adjacent said piezoelectric medium, said input transducers being arranged to generate two acoustic surface waves which propagate in opposite directions in said piezoelectric medium, said acoustic surface wave establishing means including means for applying first and second electromagnetic signals to said input transducers respectively, the first of said electromagnetic signals having the form of a delta function modulation pulse so as to interact with said second electromagnetic signal to time-invert the same.
Claim 3
Dependent Claim
23 words
Parametric surface acoustic wave apparatus according to claim 1 which comprises means for varying the time of applying the delta function modulation pulse.
References Cited (Backward Citations)
US3760172A
Cited
US3684892A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |